The scifi "dimension" is as meaningless as "plane of existence"
Does not sound too meaningless to me, but I'm used to calling that a universe 😁
think about the sentence "the universe is a part of our dimension"
I'm trying ahah. But if you call the universe a dimension, which subpart of it do you call a universe? The observable universe maybe? I mean it makes sense to say that the observable universe is part of our universe. Still sounds strange the way it is presented by OP.